diff --git a/synop2bufr/resources/synop-mappings-307080.json b/synop2bufr/resources/synop-mappings-307080.json
index 6d3c601..e6e4878 100644
--- a/synop2bufr/resources/synop-mappings-307080.json
+++ b/synop2bufr/resources/synop-mappings-307080.json
@@ -2,7 +2,7 @@
     "conformsTo": "csv2bufr-template-v2.json",
     "metadata": {
         "label": "Surface land stations (manual)",
-        "description": "csv2bufr mapping template for use with synop2bufr and converting FM-12 reports to BUFR, using BUFR sequence 301150, 307080",
+        "description": "csv2bufr mapping template for use with synop2bufr and converting FM-12 reports to BUFR, using BUFR sequence 301150, 307080. This mapping shall be used when the wind variables are estimations.",
         "version": "2",
         "author": "Rory Burke",
         "editor": "",
diff --git a/synop2bufr/resources/synop-mappings-307096.json b/synop2bufr/resources/synop-mappings-307096.json
index 84bc46d..56af942 100644
--- a/synop2bufr/resources/synop-mappings-307096.json
+++ b/synop2bufr/resources/synop-mappings-307096.json
@@ -2,7 +2,7 @@
     "conformsTo": "csv2bufr-template-v2.json",
     "metadata": {
         "label": "Surface land stations (manual)",
-        "description": "csv2bufr mapping template for use with synop2bufr and converting FM-12 reports to BUFR, using BUFR sequence 301150, 307096",
+        "description": "csv2bufr mapping template for use with synop2bufr and converting FM-12 reports to BUFR, using BUFR sequence 301150, 307096. This mapping shall be used when the wind variables are measured with an anemometer.",
         "version": "2",
         "author": "Rory Burke",
         "editor": "",